WiFi BLE Antenna

Antenna Design

Dimensioning of the antenna simulated in antenna-design.mat:

Geometry Parameters

The following parameters (in mm) define the physical layout and PCB dimensions:

Parameter	Value	Expression / Derived Value
D1	9	-
D2	2	-
D3	9	-
D4	5	-
D5	17	-
D6	0.5	-
D7	34.5	-
W1	0.8	-
W2	0.5	-
W3	1	-
L1	5.5	-
L2	5.5	-
L3	23.3	W1 + D4 + W2 + D5
PCBwidth	42.5	D7 + L1 - D6 + W3 + D2
PCBlength	41.3	D1 + L3 + D3
CopperToEdge	0.5	-

Simulation Results

Mesh Settings

To ensure accurate simulation of the resonance and impedance, the following manual meshing parameters were used:

• Max Edge Length: 0.025 m (25 mm)
• Min Edge Length: 0.004 m (4 mm)
• Growth Rate: 0.4

Return Loss (S11) & Impedance (Z)

Simulated 2.3 - 2.7 GHz range (linspace(2.3, 2.7, 80)):

Current Distribution

Surface current distribution along the antenna traces at the target resonance:

Radiation Pattern

2D Azimuth (AZ) and Elevation (EL) far-field radiation patterns:

Project Status

Design: ✅ --> Fabrication & Assembly: ✅ --> Bring-up & Tuning: ⌛

The project has been assembled and tested. It works, but still needs tuning to meet the target impedance and desired frequency range. (Note: manufacturing tolerances play a big role in antenna performance.)